Family tree and family law are made as a special genre in order to maintain family order and make sure everyone's seniority and responsibility in the family. In fact, this motivation sometimes does not reflect all actual family status, but it presents the writer's ideology and ultimate ideal to the society at that time. This paper tries to elaborate how Song Dynasty scholars with traditional Confucianism concept not only build up their families but also rule the country well according to revise their family tree and set up family law.